html, body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #007bff; /* 蓝色背景 */
  margin: 0;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 400px;
  padding: 30px;
  background-color: white;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
  border-radius: 10px;
}

.page-title {
  text-align: center;
  margin-bottom: 30px;
  font-size: 1.8rem;
  font-weight: bold;
  color: #fff; /* 白色字体 */
}

.title {
  text-align: center;
  margin-bottom: 20px;
  font-size: 1.25rem;
  color: #333;
}

.form-control:focus {
  box-shadow: none;
  border-color: #0056b3; /* 深蓝色 */
}

.register-link {
  font-size: 0.9em;
}
